The largest collection of official Monopoly sets stands at over 3,500. That record is held by Neil Scallan. The full collection can be found on WorldOfMonopoly.
His collection was last counted by Guinness World Records in September 2018 during an episode of BBC’s Bargain Hunt. 2,249 was the official count, surpassing the previous record of 1,999 (also held by Neil Scallan).
His collection is currently kept in a storage facility through SafeStore – more information about the collection can be found on their website.
While an official number for the total of Monopoly sets is unknown, it has been estimated at over 10,000.
Other Guinness World Records:
Largest Monopoly Token – 3m x 1.3m x 1m
Largest Monopoly Board – over 900m^2
Largest Monopoly Board (permanent) – 9.4m x 9.4m
Most expensive Monopoly – Over $2 million
Most people playing Monopoly – 733 people
Other ‘records’ which are commonly referenced such as longest game of Monopoly are not officially verified.